An information storage apparatus records, reproduces and/or erases information with respect to a recording medium. The apparatus includes a servo error generation detector for detecting a generation of a servo error based on at least one of servo signals including a focus error signal and a tracking error signal which are derived from output signals of a light receiving element, and a data recording resuming section for temporarily interrupting a data recording with respect to the recording medium, temporarily turning OFF a servo and then turning ON the servo again, to thereafter synchronize recording data to recorded data already recorded on the recording medium, and resume recording of the recording data continuing without a discontinuity to an end of the recorded data recorded immediately before the interruption of the data recording, when the generation of the servo error is detected while recording data on the recording medium.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An information storage apparatus for recording, reproducing and/or erasing information with respect to a recording medium, comprising: servo error generation detecting means for detecting a generation of a servo error based on at least one of servo signals including a focus error signal and a tracking error signal which are derived from output signals of a light receiving element; and data recording resuming means for temporarily interrupting a data recording with respect to the recording medium, temporarily turning OFF a servo and then turning ON the servo again, to thereafter synchronize recording data to recorded data already recorded on the recording medium, and resume recording of the recording data continuing without a discontinuity to an end of the recorded data recorded immediately before the interruption of the data recording, when the servo error generation detecting means detects the generation of the servo error while recording data on the recording medium.
2. The information storage apparatus as claimed in claim 1 , wherein the servo error generation detecting means includes means for detecting the generation of the servo error when a servo signal makes a transition from a signal level in a stable state of the servo signal to a state where the signal level is deviated by a predetermined threshold value.
3. The information storage apparatus as claimed in claim 1 , further comprising: rate changing means for changing a recording rate so as not to generate the servo error when resuming the recording by the data recording resuming means.
4. The information storage apparatus as claimed in claim 3 , further comprising: control means for resuming the recording of the recording data at a recording rate identical to a recording rate immediately before the recording is interrupted if a number of times the servo error is detected by the servo error generation detecting means is less than a predetermined number, and changing the recording rate so as not to generate the servo error if the number of times the servo error is detected is greater than or equal to the predetermined number, when resuming the recording by the data recording resuming means.
5. An information storage apparatus for recording, reproducing and/or erasing information with respect to a recording medium, comprising: servo error generation detecting means for detecting a generation of a servo error based on at least one of servo signals including a focus error signal and a tracking error signal which are derived from output signals of a light receiving element; and data recording resuming means for temporarily interrupting a data recording with respect to the recording medium, temporarily turning OFF only a tracking servo without turning OFF all servos and then turning ON the tracking servo again, to thereafter synchronize recording data to recorded data already recorded on the recording medium, and resume recording of the recording data continuing without a discontinuity to an end of the recorded data recorded immediately before the interruption of the data recording, when the servo error generation detecting means detects the generation of the servo error while recording data on the recording medium.
6. The information storage apparatus as claimed in claim 5 , wherein the servo error generation detecting means includes means for detecting the generation of the servo error when a servo signal makes a transition from a signal level in a stable state of the servo signal to a state where the signal level is deviated by a predetermined threshold value.
7. The information storage apparatus as claimed in claim 5 , further comprising: rate changing means for changing a recording rate so as not to generate the servo error when resuming the recording by the data recording resuming means.
8. The information storage apparatus as claimed in claim 7 , further comprising: control means for resuming the recording of the recording data at a recording rate identical to a recording rate immediately before the recording is interrupted if a number of times the servo error is detected by the servo error generation detecting means is less than a predetermined number, and changing the recording rate so as not to generate the servo error if the number of times the servo error is detected is greater than or equal to the predetermined number, when resuming the recording by the data recording resuming means.
9. An information storage apparatus for recording, reproducing and/or erasing information with respect to a recording medium, comprising: a servo error generation detecting part configured to detect a generation of a servo error based on at least one of servo signals including a focus error signal and a tracking error signal which are derived from output signals of a light receiving element; and a data recording resuming part configured to temporarily interrupt a data recording with respect to the recording medium, temporarily turn OFF a servo and then turn ON the servo again, to thereafter synchronize recording data to recorded data already recorded on the recording medium, and resume recording of the recording data continuing without a discontinuity to an end of the recorded data recorded immediately before the interruption of the data recording, when the servo error generation detecting part detects the generation of the servo error while recording data on the recording medium.
10. The information storage apparatus as claimed in claim 9 , wherein the servo error generation detecting part includes a part configured to detect the generation of the servo error when a servo signal makes a transition from a signal level in a stable state of the servo signal to a state where the signal level is deviated by a predetermined threshold value.
11. The information storage apparatus as claimed in claim 9 , further comprising: a rate changing part configured to change a recording rate so as not to generate the servo error when resuming the recording by the data recording resuming part.
12. The information storage apparatus as claimed in claim 11 , further comprising: a control part configured to resume the recording of the recording data at a recording rate identical to a recording rate immediately before the recording is interrupted if a number of times the servo error is detected by the servo error generation detecting part is less than a predetermined number, and to change the recording rate so as not to generate the servo error if the number of times the servo error is detected is greater than or equal to the predetermined number, when resuming the recording by the data recording resuming part.
13. An information storage apparatus for recording, reproducing and/or erasing information with respect to a recording medium, comprising: a servo error generation detecting part configured to detect a generation of a servo error based on at least one of servo signals including a focus error signal and a tracking error signal which are derived from output signals of a light receiving element; and a data recording resuming part configured to temporarily interrupt a data recording with respect to the recording medium, temporarily turn OFF only a tracking servo without turning OFF all servos and then turn ON the tracking servo again, to thereafter synchronize recording data to recorded data already recorded on the recording medium, and resume recording of the recording data continuing without a discontinuity to an end of the recorded data recorded immediately before the interruption of the data recording, when the servo error generation detecting part detects the generation of the servo error while recording data on the recording medium.
14. The information storage apparatus as claimed in claim 13 , wherein the servo error generation detecting part includes a part configured to detect the generation of the servo error when a servo signal makes a transition from a signal level in a stable state of the servo signal to a state where the signal level is deviated by a predetermined threshold value.
15. The information storage apparatus as claimed in claim 13 , further comprising: a rate changing part configured to change a recording rate so as not to generate the servo error when resuming the recording by the data recording resuming part.
16. The information storage apparatus as claimed in claim 15 , further comprising: a control part configured to resume the recording of the recording data at a recording rate identical to a recording rate immediately before the recording is interrupted if a cumber of times the servo error is detected by the servo error generation detecting part is less than a predetermined number, and to change the recording rate so as not to generate the servo error if the number of times the servo error is detected is greater than or equal to the predetermined number, when resuming the recording by the data recording resuming part.
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May 16, 2001
August 16, 2005
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